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Summary of Significant Accounting Policies - Liquidity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Accumulated deficit | $ 157,177 | $ 139,724 |
Net cash used in operations | 14,519 | 17,530 |
Cash and cash equivalents | 25,120 | 22,408 | $ 27,900
Short-term investments | 97,103 | $ 0 |
Debt covenant minimum cash balance | $ 5,000 |  |
Minimum |  |  |
Debt Covenant [Line Items] |  |  |
Quarterly increase in revenue target (percent) | 2.00% |  |
Maximum |  |  |
Debt Covenant [Line Items] |  |  |
Quarterly increase in revenue target (percent) | 4.00% |  |

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